Package g0401_0500.s0420_strong_password_checker

Class Solution

java.lang.Object
g0401_0500.s0420_strong_password_checker.Solution
public class Solution extends Object
420 - Strong Password Checker.<p>Hard</p> <p>A password is considered strong if the below conditions are all met:</p> <ul> <li>It has at least <code>6</code> characters and at most <code>20</code> characters.</li> <li>It contains at least <strong>one lowercase</strong> letter, at least <strong>one uppercase</strong> letter, and at least <strong>one digit</strong>.</li> <li>It does not contain three repeating characters in a row (i.e., <code>&quot;...aaa...&quot;</code> is weak, but <code>&quot;...aa...a...&quot;</code> is strong, assuming other conditions are met).</li> </ul> <p>Given a string <code>password</code>, return <em>the minimum number of steps required to make <code>password</code> strong. if <code>password</code> is already strong, return <code>0</code>.</em></p> <p>In one step, you can:</p> <ul> <li>Insert one character to <code>password</code>,</li> <li>Delete one character from <code>password</code>, or</li> <li>Replace one character of <code>password</code> with another character.</li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> password = &ldquo;a&rdquo;</p> <p><strong>Output:</strong> 5</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> password = &ldquo;aA1&rdquo;</p> <p><strong>Output:</strong> 3</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> password = &ldquo;1337C0d3&rdquo;</p> <p><strong>Output:</strong> 0</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= password.length <= 50</code></li> <li><code>password</code> consists of letters, digits, dot <code>'.'</code> or exclamation mark <code>'!'</code>.</li> </ul>

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • strongPasswordChecker

      public int strongPasswordChecker(String s)